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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1065bb9909fcb28e1abb685595bdecedbaf5350c0ce072b7603acbb9527760' 
  AND token = '/m0d4lHHmiTu/zYn5ZJYgrXS4Ipo/DPi3zEg5ecyDdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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