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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe78a2afd7b7912d63d3925c7657d3e7e41b110ab3a69e5f236904bbcede0a5d' 
  AND token = 'F9B15ETZ6Ar7aLmUwFSt4f44DXJC2J30/KomGFW4unU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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