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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e007ec83026822ef335c6a3285b29429a649ae5b6e9c4ed632f6c82cf15048' 
  AND token = 'Wh2Mt3lRhiicD+6rEXCTNulEiRPJl0etFhTSA3YZjtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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