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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c725378f47ac39adec3cc1b580d5c8a604a076b1ad36a8acec1c1560bbb893bd' 
  AND token = 'LOtfHjbn0ljcXtGun+CaWLgIofBIFcKH41LKfANe9hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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