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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd493bc073e9400dd1f675322859b208adde8c657f0afc2734a8365d1bedb70bb' 
  AND token = 'gp5h2N3Cbrm/vZAWVMf+FBndUZ9y0cAoP+jsV+fgm2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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