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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7027f09bf08a4626622651d6bd94bde5a723f30453091387ad6e3ed4d3e70a' 
  AND token = 'crmiUYa8/5R4xoYf5a9eEwczEchs2K0sNC+iL7wYG/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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