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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c007e670b5189050cc5959fdb5d11d5cc29a8eccb03841ba282a983b05964b04' 
  AND token = 'NQR1jn0elX+9cJefSq7QqnzKs+T858lfGXetGHdILfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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