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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f5652b297626ee20d6560bf4a2255edd31e4fbcb3e73c4c1bb78473ddf5a6b' 
  AND token = 'jZMj4LjXppo8Vhelw3y3i15clEqLIyacvGAdVPr+fo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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