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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76344fa5528aa79c03ef838bb35344ce738247c1b4a5b7e9d072f2cd0db597ce' 
  AND token = '3D4SMQC6JcFyCxA2Hw6pBoDqeDg6mp/N6V3SBkMkSyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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