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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cbc78ac4479bba48f247bd8077f5402fd673f5a075d5aeaf546aac1e67759d' 
  AND token = 'mp9nZH70W3f0ljF51MTNaeeAXek55fFYxJoCEniBNGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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