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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af63cc98a767215bcdff0afaa3d78f86200f89014db9981f13dbc63aeffbf9ed' 
  AND token = 'MoM6BzOf6GHNFEGF1D+8d4YQQ67oSeYtwMsPDSw5cxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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