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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72511fde9ffd3412805e126908e6172823adfd4420c507a6a47318f17b32df94' 
  AND token = '/rOw/s0edRNJv6JMoyCCgJFDI//AXtSb1KZLgzNlJOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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