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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b944a7a7d2e1518ed3313513fb58727352cefce8d383342d7a7a4418f91db4cf' 
  AND token = 'DSA3aTV+shhOdjlpje+C/0fFE3BJ5UDoHeq3F9a6Xx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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