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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35ca1cb57cc77b2f3d499aeee9d9209180a3d847addd5cfedb2f20c54338404' 
  AND token = 'z7RH1cRSWSRPSnDZej0YKnvf2mA1Fe/NxhZrzQC+8LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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