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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e52cffe589ca2b9762b30bfad745e18b8fe61b5480ec92520ea47ac4c0481a2' 
  AND token = 'k9QOzAoiDUTW2dkpGwn0gMGSUCa0OumlNqYOS2fsMyQ=' 
  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"
    }
  }
}