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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136d2a616b33d490dfc43c69dba879c059c61286b62335da13b1620e691debd6' 
  AND token = 'VR9f+75qWd3rmhPP0WLXOhhSO0DPM9xAgJ401c3RId4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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