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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7e3727854a1dc0a21547d40df5ca9fceb512be2283adbad813fe5c5c156631' 
  AND token = '2eiVibFrom+wtzxWAxpJqModiyqthqY+KUJa2+iCUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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