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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cec274af91b8d049b68d2f5b5eddd810a9d69929865563cdf89ac388a628bf' 
  AND token = 'tn39fKOAHRSFqPnGJJ57vpPS3nPkJ0B3DcDcmvGQbTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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