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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700d15920b513be5ae139b2d8e6c4bf4ee812f264c60ff10c2fda6a7e9db5c0c' 
  AND token = 'lY4tCdcufzpAxMIygMxV0H6VrziRCup6A75TjBwai9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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