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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9bc8bd478a4df160de33f71924c8e963d53391f16e88fa0090d0919905feb4' 
  AND token = 'NYuWz/3taPM0DlXP6sqGil7sDJCwMbW66sSgIfreUuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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