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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5663a41f21116bddd26a8ad1a44875cc0b28600e4a9e024e195b59da171588' 
  AND token = '4XWV7jKB4+iZ2KC56Rs7QgY0Sor6q66K9LbLXqdTKc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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