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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86599b1748c4282dd79235eb6b2b09c3d00ab3f019543e325d742703fa7ddbd4' 
  AND token = 'OLYSM0nlA1Ki5vAaMF5clNH9NxIl7PSUHeuB+q0NKLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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