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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3887aa746030e02a28a4e9797a5496f43d7cf94779228f95bb9fc1808b6840d' 
  AND token = 'vqR1+yQyK3Y0o2+EYLorCOeZmWZ9so2Wf+aA97N40H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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