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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b17a5c55419bb1ebd6dcdeb8262e74a2c856820c01cbd4f3614be2b9acafe2b' 
  AND token = '+d2D5Rfdst+BdB3pq3ajdlIE+HSp19DnLY4T/RPmNBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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