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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8472124e4899e80237e2d39807160035c2afecd65ff7a0f3765b7b9c85e594f7' 
  AND token = '89LW7mX6bG3Wgiau+RWnKVvo6ot+agTN1X5nirAOyo4=' 
  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"
    }
  }
}