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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74aafb25e340f620b36fc4b0c39fb38ea82c031417ce199001db57b3b4fc21e7' 
  AND token = '/FFaw/BxGaAot3/o/Uj8PrFLPMsK7oiVTFmFk3xumiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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