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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e6cf7fa87735495c7411a4b4582860fc8b43189f52d4d1d646b25d06008a7e' 
  AND token = 'yaF1oyMoFPxvr2oJkttlY+zQDR7wfF2yDSImxAnUZs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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