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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ed819d71e04abdaa724498ba1855d2a6903d451f20a2b93eeba1915622b311' 
  AND token = 'T9Z2W0Pi4jRZVWUPaHKq0BkUrL3KPy1CW4tm252cblw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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