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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de39da901001a7f957394e6a76ae33b4b32dfffaf81486d61bf8c418546aba37' 
  AND token = 'TGA1aEpUN0g0CB/cmG7vRQ7tvjfcsoRThFgdo6/QQ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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