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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6974b108be8d6c8d87801d43051041e524716d52b3649e3d88713e0e71b9bdfb' 
  AND token = 'VKgZLg4iDQBEQ2GQsSd97pT4iYSbeew4tbc/G+9FuuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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