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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c532614d07246ac0549fa429df2234cf93252a2f2dc516a4d88273b3584a3c05' 
  AND token = 'VzxuENQlUBwV20m07uX+IjrXs1GXO4O32AQVxW+8al0=' 
  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"
    }
  }
}