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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6c02433789fd488509d4d553d22a6234b1caf65b356ac1195c584f63d13c0a' 
  AND token = 'Oy45Y0curDCBux0dGSXC74i3ob1dyNu/Mp1VCcJ7FKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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