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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507c32c5455507c45cf7b3523de3a8417be8a783f95b0b9ed3394c8f92f67289' 
  AND token = 'rqvp5GUA9LtTV8M5yI3WU6DkoyTR9jpmO/jQz8qy+Mw=' 
  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"
    }
  }
}