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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af29a483ab282eaba0ca3833a4059b9a36c44e14cf882b8b4babdfad7d9b42b' 
  AND token = 'kTYRoGYnAr+qNI19uFgfRuSnMxvR2o/zwUPRij8AL0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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