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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0203d99f0fcc09f37579cb4759c05f3ecf54a064160d3dc23e7bda193ff7691' 
  AND token = 'xGKRune8tjRJ3YGfi10b3wJWGv3FWjNb7RQYtfqXIEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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