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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b682f335ba5c74b12b9ef8f0a4cafea1b832eb33698182ebc00d32c387457f5' 
  AND token = 'C6r0s8CaotrbLhHtlOAX4z9kDaGGTwj1cnMl8Ifi0o8=' 
  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"
    }
  }
}