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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0e6a8920ddfd55a0e8d0a2995e75bde6c4a8a85ecec03b6307065d944266d8' 
  AND token = 'FQo9pq6mpujpWb77NPEZH9xCtln+0ia/eyCIfvl2CEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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