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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beed4dfe0be9b8e13e3569c6d197432d571304dc91943cfe82b6868fe0f6c63' 
  AND token = 'xw3yjnEyVa1gyhUvIwpv9Y018zH4toATYnZ4npyH6ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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