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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedf560e5d428188f02d568b8eb6d46523d1c563f88cb0d91adeefd1c910938b' 
  AND token = 'cAWPzChQZfIIbu+zuQwaYl52nxOgTRJRS7ogxn+KN00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}