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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c887c22b687bb6fa31a2216a9bc5d50a5c84f18f6cbe3c3714fd19ce8aca08aa' 
  AND token = 'MqvMQsBtymvkkjyuFYQmL1Em/t8T4uBTe50yvBhL8EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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