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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361b822b3421805ed268c4a47d7bc1ccac7448f23b6039e57813319657e0fc1d' 
  AND token = 'fzGlxvAFQI05fAErgFpgZbZz/efe4lvRwp6d2f8j2lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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