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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f4737e69c7c40c9725d633692b2cc49a79889f155f316a20f458f6ffa116c0' 
  AND token = 'Wqd46+yvb8GUqhpmXUeDg4vc5yWqA2T7PKnA+73gDac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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