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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed89a2e923728d6c40e2dae9ef389413ae4eebd44eb44db660463a1be86a367f' 
  AND token = 'i/3ozq6Beeg/ZT4baA5Kgjvr5YFmUczdYAzQD6k4q6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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