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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead1d59437d60e519f2b6d2072baa8b4d4bf5a98a762654d688bbf7a4ca29788' 
  AND token = '+tGopv9rATTRflgOmfM/rbU0pp5B0JF2VQ6xbPF4D0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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