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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece6e881f62f5990afc949bfd0a1f0992439081618d3e415d3e835c7911b6f1b' 
  AND token = 'NLM5+/Fpi9A5V9LWQVLbhDu7j5IV7CbA3uIeyAZ+d38=' 
  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"
    }
  }
}