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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9f15f0e522fe430cc4e1781016e73a4023438ff06af8fff95544f10074640c' 
  AND token = '9HDmW0qrG5jpYd5GU2y4yb95Amd4lu6XGj9+hM0tviw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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