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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3a58e495b59903987b4a96d74f135d6737d4d7263a289b896a45b81d0b280b' 
  AND token = 'scXIiwwd5bgSVKK4148YDD8jkw/QpvH/QEcXMfA7VsU=' 
  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"
    }
  }
}