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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0330a448d8676ffce7a0fcf7e2fe2d2180069a8de42bafacb4ee0cf4fce9e15a' 
  AND token = '73A6tDllciihMZZ+SXIatia5jX1sJ6AzCZaYdWgAOes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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