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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced29af9c88103ffb40d829268887e4d6c4cfd461d319cce3f2d520245311ad8' 
  AND token = 'tNX1z4In9I7DCaH/efg1gAYriqmiB1und4ctSHjEpFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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