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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b148f25946e98117bbd9ab5084d6a118dfd80b849693e3fab61afd6788330b0' 
  AND token = 'h56UEfhl+lNr+adOtQ8W0nUBb0AvUGzxFyx4xZDpznM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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