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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7379c7e8124ee00cbabf3f7d7273d36b939599cec89e30674f326338693c725' 
  AND token = 's0vM82wn7WltGjRVbMDwPMxRvG5uwviN7xOsCm46yuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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