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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fb41028cf141fe3a84713156bdf069bff8ef12c857dcd104de4d3bf4134656' 
  AND token = 'ogo11iLHDjd51cVAKTVPzVwIHWjiluXLIM1u9+fSmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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