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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95577b8432a2b13e5f0cceb03fb14fd2288437fbcacbc8cc5e6403a674e5457' 
  AND token = 'Ep6jUlBdbDIoEiukrUm8NCpbWb6isF/u3c1at5eTbXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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