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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d638afc4a591f9c25d9ce9cab92a8c3d9662a1a007a74b76135d7676049210b' 
  AND token = 'bkQ9fYeT0kTnGsojsAQwhid8karLDweuemF/CAX8fCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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