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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30e5ef97decec10c56e3e0dfad16d92bb6485c5bf96bc4b88bfea812d31018e' 
  AND token = 'DgLFEB2ALiIYq0MVMTnfy76G8yHk1lmdnP/ewaiXeDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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