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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce57be521d3e200ac2ab0247cfa8c722b3c78fd3ee58743820d26152b2e362b0' 
  AND token = 'k58gcBmENysE492UxYJaAQEBd9EK8Mem1H+zJsjAnnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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